How old is our species Homo sapiens

Domestic use of water only refers to water used in private households. true or false?

Explain why an energy pyramid in any ecosystem typically is limited to four or five levels only.

Salivary amylase is an enzyme found in the mouth. It speeds up the reaction of breaking down starch into sugars.

When a person is exposed to a cold environment: Select one: a. the skin becomes flushed secondary to peripheral vasodilation. b. sweat is produced and is warmed when the vessels constrict. c.

ADP had more chemical energy than ATP : true or false

Suppose a large number of dead fish are found floating in a lake. how would you determine whether they died from cultural eutrophication or from exposure to toxic chemicals?

Which best explains how gravity contributes to the formation of layers in protoplanets? Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

1. As an object moves towards another object the sound waves bunch up. True Or False 2. As an object moves toward another object the sound waves have lower frequency. True or False. 3.

Do we classify viruses as living

What caused the evolution of antibiotic-resistant bacteria?